Power Profiler Kit fails to measure milliamps correctly

RE: Power Profiler Kit fails to measure milliamps correctly

Jarmo — Wed, 18 Oct 2017 09:00:24 GMT

No I didn't. But I was able to set the resistor calibration values so that the measures are correct, as said above.

RE: Power Profiler Kit fails to measure milliamps correctly

erltot — Wed, 18 Oct 2017 08:11:40 GMT

Did you figure this out? This seems related: devzone.nordicsemi.com/.../

RE: Power Profiler Kit fails to measure milliamps correctly

wlgrd — Thu, 04 May 2017 11:53:41 GMT

That is indeed a very dramatic change, and it sounds to me like there are some switching that is not working as it should. Can you try and measure pin 1 and 2 on connector P10 when expecting current draws of 10uA, 1mA and 10mA? These signals is routed to the switches, and if they work, the actual analog switches has failed.

RE: Power Profiler Kit fails to measure milliamps correctly

Jarmo — Tue, 02 May 2017 13:06:56 GMT

Now I made calibration with a resistor of 337.5 ohm and needed to change values in "Resistor calibration" / "Hi" from 1.798 to 13.15 to get correctly 8.89 mA when using 3000 mV output. This is quite a dramatic change in calibration and sounds strange. Can you imagine any explanations?

RE: Power Profiler Kit fails to measure milliamps correctly

Jarmo — Mon, 13 Mar 2017 13:14:13 GMT

WIth a 6.8 kOhm resisor the value was quite correct, 440 uA. So the problem seems to be with higher currents. Have to do those measurements you mention.

RE: Power Profiler Kit fails to measure milliamps correctly

wlgrd — Thu, 09 Mar 2017 10:29:32 GMT

Can you verify your switch positions (i.e exernal dut, power select). Can you measure the External DUT output when using the Power Select in Reg. position and setting it to 3V from software? Also, try with a higher resistor value, like 500k, and see if that also measures completely wrong.

Please try to measure both External DUT and DK to see if we can come closer to a solution. Let's hope the board is not broken.